CN105628244A - Pt100 temperature sensor-based novel high-precision temperature measurement circuit - Google Patents
Pt100 temperature sensor-based novel high-precision temperature measurement circuit Download PDFInfo
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- CN105628244A CN105628244A CN201410622467.XA CN201410622467A CN105628244A CN 105628244 A CN105628244 A CN 105628244A CN 201410622467 A CN201410622467 A CN 201410622467A CN 105628244 A CN105628244 A CN 105628244A
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- 238000009529 body temperature measurement Methods 0.000 title claims abstract description 20
- 238000007599 discharging Methods 0.000 claims description 3
- 230000003321 amplification Effects 0.000 abstract 5
- 238000003199 nucleic acid amplification method Methods 0.000 abstract 5
- 238000000034 method Methods 0.000 description 9
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 229910052697 platinum Inorganic materials 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000000873 masking effect Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000000474 nursing effect Effects 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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Abstract
A Pt100 temperature sensor-based novel high-precision temperature measurement circuit of the present invention is characterized in that two constant current sources are designed at the two ends of a Pt100 temperature sensor, so that the current of the circuit is constant, and the circuit is not interfered by the current fluctuation in the circuit easily. Then a two-stage amplification circuit is designed to amplify a signal acquired by the Pt100 temperature sensor, and a constant voltage source is added in each stage of amplification circuit to provide a stable reference voltage to the circuit. The Pt100 temperature sensor-based novel high-precision temperature measurement circuit of the present invention is high in temperature measurement accuracy and stable and reliable in system operation, and enables the performance temperature and the error to satisfy the actual requirements. The Pt100 temperature sensor-based novel high-precision temperature measurement circuit comprises two constant current source modules, the Pt100 temperature sensor, the two-stage amplification circuit, a main control chip, a JTAG downloading module and a display module, and the structural key points of the circuit are that the output of the two constant current source modules is connected with the input of the Pt100 temperature sensor, the output of the Pt100 temperature sensor is connected with the two-stage amplification circuit, the output of the two-stage amplification circuit is connected with one input end of the main control chip, the other input end of the main control chip is connected with the JTAG module, and one output end of the main control chip is connected with the display module.
Description
Technical field
The present invention is applied in many fields such as industrial or agricultural, national defence, space flight and scientific research, more particularly to one based on Pt100 novel high-precision temperature measurement circuit.
Background technology
In many fields such as industrial or agricultural, national defence, space flight and scientific researches, temperature survey all plays very important effect always. Traditional thermometric instruments low-response, precision are low, poor reliability, efficiency are low, do not adapt to the demand of modern chemical industry industry. Along with the development of sensor technology and electronic measurement technique, the temp measuring system based on single-chip microcomputer is widely used to the various aspects of life.
Pt100 is wound on Muscovitum support makes with very thin platinum filament, is internationally recognized high precision measuring temperature standard transducer. Because platinum resistance is in Oxidant, even under high temperature, its physics, chemical property are all highly stable, and therefore it has the feature of precision height, good stability, dependable performance. Therefore platinum resistance can be used widely within the scope of-200��650 DEG C. Pt100 is resistance temperature detector, and the essence of thermometric is the resistance measuring sensor in fact, it is common that the change of resistance converts to the analogue signal such as voltage or electric current, then converts analog signals into digital signal, then conversed corresponding temperature by processor. Therefore the high precision measuring temperature circuit based on Pt100 temperature sensor is used widely in the industry.
But, current Pt100 temperature sensor measurement inefficiency in many temperature measurement circuits design, in order to improve the accuracy of Pt100 temperature sensor thermometric, the appearance of novel high precision measuring temperature is of great value.
Summary of the invention
The present invention is aiming at the problems referred to above, makes up the deficiencies in the prior art, it is provided that a kind of based on Pt100 novel high-precision temperature measurement circuit; The present invention devises two-way constant-current source at the two ends of Pt100 temperature sensor, makes the current constant of circuit, the interference being not easily susceptible in circuit current fluctuation; Then devising second amplifying circuit, the signal that Pt100 is collected is amplified, and adds constant pressure source again in every one-level amplifying circuit, for the reference voltage of circuit with stable; The present invention has temperature measurement accuracy height, performance temperature, error meet actual requirement, and system run all right is reliable.
For realizing the above-mentioned purpose of the present invention, the present invention adopts the following technical scheme that.
The present invention is a kind of to be made up of hardware and software two parts based on Pt100 novel high-precision temperature measurement circuit, and wherein hardware components includes two-way constant-current source module, Pt100 temperature sensor, second amplifying circuit, main control chip, JTAG download module, display module; Its structural feature is: the output of described two-way constant-current source module connects the input of Pt100 temperature sensor, and the output of Pt100 temperature sensor connects second amplifying circuit, and the output of second amplifying circuit connects an input of main control chip; Another input of described main control chip connects JIAG module, and an outfan of described main control chip connects display module.
As a preferred embodiment of the present invention, the Atmega16, described Atmega16 of described main control chip employing AVR series self are provided with jtag interface, 10,8 tunnel has the ADC of optional differential input stage programmable-gain, programmable watchdog intervalometer, a SPI serial port.
As the another kind of preferred version of the present invention, described two-way constant-current source module adopts integrated transporting discharging LM324AD to constitute, and the reference voltage of wherein said two-way constant-current source module is provided by the reference voltage output terminal of TL431.
Constitute as the another kind of preferred version of the present invention, described second amplifying circuit adoption rate differential amplifier circuit and scaling circuit; Wherein said proportional difference amplifying circuit adds constant pressure source TL431 offer as the reference voltage, and described scaling circuit adds constant pressure source LM4040 offer as the reference voltage.
It addition, software section of the present invention includes filtering algorithm and binary chop algorithm; Wherein said filtering algorithm is by software algorithm, the data obtained to be processed, thus masking noise and interference noise signal etc., thus obtaining available truthful data, namely by the process of the mode data acquisition signal of routine processes, thus reliability is high, good stability, and it is absent from resistance matching problem; It is few that described binary chop has number of comparisons, lookup speed is fast, the advantage that average behavior is good, it is more suitable for and infrequently changes and search ordered list frequently, owing to Pt100 temperature sensor is when variations in temperature, the change of resistance is not linear, and therefore the present invention adopts the method for binary chop to calculate temperature.
The invention has the beneficial effects as follows.
The present invention provides a kind of circuit with high precision measuring temperature novel based on Pt100; Wherein first hardware circuit devises two-way constant-current source at the two ends of Pt100 temperature sensor, make the current constant of circuit, the interference being not easily susceptible in circuit current fluctuation; Then devising second amplifying circuit, the signal that Pt100 is collected is amplified, and adds constant pressure source again in every one-level amplifying circuit, for the reference voltage of circuit with stable. In software design, first pass through A/D and be converted to digital signal, then use anti-impulse disturbances average filter method, to filter the interference signal of generation, calculate finally by binary chop and obtain corresponding temperature value, and show.
The present invention gives a kind of new thermometric scheme based on Pt100, scheme adopts the three-wire system connection of Pt100 temperature sensor, eliminate the impact on measurement result of the resistance on wire, and carry out nursing one's health compensation to initial signal with constant-current source, improve the stability of signal, process is amplified with the secondary circuit of constant pressure source, A/D conversion, and with software, digital signal is filtered, finally adopt binary chop to calculate temperature, and show. Practical application shows, thermometric scheme temperature measurement accuracy height of the present invention, performance temperature, error meet actual requirement, and system run all right is reliable.
Accompanying drawing explanation
Fig. 1 is a kind of the general frame based on Pt100 novel high-precision temperature measurement circuit of the present invention.
Fig. 2 is a kind of system overview flow chart based on Pt100 novel high-precision temperature measurement circuit of the present invention.
Detailed description of the invention
As it is shown in figure 1, be a kind of the general frame based on Pt100 novel high-precision temperature measurement circuit of the present invention. Wherein, including two-way constant-current source module, Pt100 temperature sensor, second amplifying circuit, main control chip, JTAG download module, display module; Its structural feature is: the output of described two-way constant-current source module connects the input of Pt100 temperature sensor, and the output of Pt100 temperature sensor connects second amplifying circuit, and the output of second amplifying circuit connects an input of main control chip; Another input of described main control chip connects JIAG module, and an outfan of described main control chip connects display module.
The Atmega16, described Atmega16 of main control chip of the present invention employing AVR series self are provided with jtag interface, 10,8 tunnel has the ADC of optional differential input stage programmable-gain, programmable watchdog intervalometer, a SPI serial port. ATmega16 is based on 8 CMOS microcontrollers of low-power consumption of the AVRRISC structure of enhancing, there is abundant instruction set, the In-System Programmable Flash of 16K byte, 512 byte EEPROM, 1K byte SRAM, 32 universaling I/O port lines, 32 general purpose working registers, all of depositor is all directly patrolled unit (ALU) with computing and is connected, make an instruction can access two independent depositors within a clock cycle simultaneously, this structure substantially increases code efficiency, and there is the data throughput being up to 10 times than common CISC microcontroller, such that it is able to the contradiction that relieving system is between power consumption and processing speed.
Two-way constant-current source module of the present invention adopts integrated transporting discharging LM324AD to constitute; Wherein reference voltage is provided by the reference voltage output terminal of TL431. TL431 is controllable accurate source of stable pressure, is a kind of parallel voltage-stabilizing integrated circuit, and performance is good, price is low, any value that its output voltage just can be arranged from 2.5V to 36V in scope arbitrarily with two resistance. Two-way constant-current source is connected to the two ends of temperature sensor Pt100, the signal collected is converted to the voltage signal of standard, second constant-current source outfan uses the slide rheostat of 2K, it is therefore an objective to can regulate the size of electric current, and the size making two-way constant-current source is identical.
Described second amplifying circuit adoption rate differential amplifier circuit and scaling circuit are constituted. Wherein first order amplifying circuit is proportional difference amplifying circuit, adds constant pressure source as the reference voltage in first order amplifying circuit, makes circuit have constant reference voltage, and the circuit that the reference voltage of constant pressure source is made up of TL431 provides; Second level amplifying circuit is scaling circuit, makes signal again amplify; Second level amplifying circuit also adds constant pressure source, constant reference voltage level is provided for amplifier, constant pressure source adopts the mu balanced circuit of LM404085 composition to provide burning voltage, LM4040 has temperature range width, the output mode of adjustable voltage, it is not necessary to filter capacitor and exportable high-precision reference voltage.
It addition, software section of the present invention includes filtering algorithm and binary chop algorithm; Wherein said filtering algorithm is by software algorithm, the data obtained to be processed, thus masking noise and interference noise signal etc., thus obtaining available truthful data, namely by the process of the mode data acquisition signal of routine processes, thus reliability is high, good stability, and it is absent from resistance matching problem; It is few that described binary chop has number of comparisons, lookup speed is fast, the advantage that average behavior is good, it is more suitable for and infrequently changes and search ordered list frequently, owing to Pt100 temperature sensor is when variations in temperature, the change of resistance is not linear, and therefore the present invention adopts the method for binary chop to calculate temperature.
As in figure 2 it is shown, be a kind of system overview flow chart based on Pt100 novel high-precision temperature measurement circuit of the present invention. Temperature, displays temperature is calculated including system initialization, A/D conversion, software filtering, binary chop; First system is initialized by program, then the data that amplifying circuit transmission comes are carried out A/D conversion, the data of storage A/D conversion, the data acquisition of software storage is filtered by anti-impulse disturbances average filter method, averaged, calculates corresponding temperature by the data acquisition binary chop obtained and shows.
Claims (4)
1., based on a Pt100 novel high-precision temperature measurement circuit, wherein hardware components includes two-way constant-current source module, Pt100 temperature sensor, second amplifying circuit, main control chip, JTAG download module, display module; It is characterized in that: the output of described two-way constant-current source module connects the input of Pt100 temperature sensor, the output of Pt100 temperature sensor connects second amplifying circuit, and the output of second amplifying circuit connects an input of main control chip; Another input of described main control chip connects JIAG module, and an outfan of described main control chip connects display module.
2. one according to claim 1 is based on Pt100 novel high-precision temperature measurement circuit, it is characterized in that: the Atmega16, described Atmega16 of described main control chip employing AVR series self are provided with jtag interface, 10,8 tunnel has the ADC of optional differential input stage programmable-gain, programmable watchdog intervalometer, a SPI serial port.
3. one according to claim 1 is based on Pt100 novel high-precision temperature measurement circuit, it is characterised in that: described two-way constant-current source module adopts integrated transporting discharging LM324AD to constitute.
4. one according to claim 1 is based on Pt100 novel high-precision temperature measurement circuit, it is characterised in that: described second amplifying circuit adoption rate differential amplifier circuit and scaling circuit are constituted.
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| CN201410622467.XA CN105628244A (en) | 2014-11-07 | 2014-11-07 | Pt100 temperature sensor-based novel high-precision temperature measurement circuit |
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| CN201410622467.XA CN105628244A (en) | 2014-11-07 | 2014-11-07 | Pt100 temperature sensor-based novel high-precision temperature measurement circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108742545A (en) * | 2018-05-23 | 2018-11-06 | 周欣荣 | A kind of real-time ocular temperature-detecting device of contact |
| CN109341890A (en) * | 2018-10-22 | 2019-02-15 | 安徽鸿创新能源动力有限公司 | A kind of BMS temperature acquisition system and measurement method based on NTC temperature sensor |
| CN112461397A (en) * | 2020-11-26 | 2021-03-09 | 云南电网有限责任公司电力科学研究院 | Electronic thermometer for detecting field temperature of oil-immersed transformer |
| CN119223479A (en) * | 2024-12-04 | 2024-12-31 | 山东鲁南瑞虹化工仪器有限公司 | A pt100 resistor high-precision temperature measurement control system |
-
2014
- 2014-11-07 CN CN201410622467.XA patent/CN105628244A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108742545A (en) * | 2018-05-23 | 2018-11-06 | 周欣荣 | A kind of real-time ocular temperature-detecting device of contact |
| CN109341890A (en) * | 2018-10-22 | 2019-02-15 | 安徽鸿创新能源动力有限公司 | A kind of BMS temperature acquisition system and measurement method based on NTC temperature sensor |
| CN109341890B (en) * | 2018-10-22 | 2021-05-14 | 安徽鸿创新能源动力有限公司 | BMS temperature acquisition system and measurement method based on NTC temperature sensor |
| CN112461397A (en) * | 2020-11-26 | 2021-03-09 | 云南电网有限责任公司电力科学研究院 | Electronic thermometer for detecting field temperature of oil-immersed transformer |
| CN119223479A (en) * | 2024-12-04 | 2024-12-31 | 山东鲁南瑞虹化工仪器有限公司 | A pt100 resistor high-precision temperature measurement control system |
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